Thumb-tack



Y. KINOSHITA.

THUMB TACK.

APPLICATION FILED FEB. 24. 1919.

1,338,988. 7 Patented May 4, 1920.

Wwrfmw 'BY q ATTORNEY l YOKICHI KINOSHITA, 0F BOSTON, MASSACHUSETTS.

THUMB-TACK.

Specification of Letters Patent.

Patented May 4, 1920.

Application filed February 24, 1919. Serial No. 278,587.

To all whom it may concern Be it known that I, YOKICHI KINosHrra, asubject of the Emperor of Japan, and resident of Boston, in the countyof Suffolk,

State of Massachusetts, have made a certain new. and useful Invention inThumb- Tacks, of which the following is a specification.

This invention relates to thumb tacks, and is directed especially tosuch tacks as are employed by draftsmen, artists and engineers.

The object of the invention is to provide a thumb tack which will servethe purpose of holding drawing paper, bristol board, or the like, insecure position, without necessitating the paper, board or the likebeing punctured or otherwise marred by the thumb tack.

Further objects of the invention will be more fully hereinafter setforth.

The invention consists substantially in the construction of the thumbtack, all as will be more fully hereinafter set forth, as shown by theaccompanying drawing, and finally pointed out in the appended claim.

Referring to the drawing,.

Figure l is a plan view of a stamping from which the thumb tack of myinvention is constructed.

Fig. 2 is a perspective view of the completed thumb tack.

Fig. 3 is a view in elevation of the same.

Fig. 4 is a plan view of a modified form of thumb tack embodying myinvention.

Fig. 5 is a sectional view of the same, taken on the line 5, 5, Fig. 4,and looking in the direction of the arrows.

Fig. 6 is a view' in side elevation of a still further modifiedconstruction embodying my invention.

The same part is designated by the same reference numeral wherever itoccurs throughout the several views.

through the drawing paper, or the like, the same may lie at the sidethereof with the head of the tack securely holding the draw in paper orthe like in place.

Ideferring to Fig. 1, I show one form of tack constructed in accordancewith my invention wherein the same is produced by stamping the same outof a sheet of suitable material such as sheet metal. The head 2 is ofenlarged size and the pointed prong or tongue 3 which is so shaped tofacilitate being forced into the drawing board or the like, is formedintegral with the head 2, and extends from the ap roximate center of oneedge of the head. fhe tongue or prong is then bent downwardly as shownin Figs. 2 and 3 to substantially right angles to the head 2, and it isapparent that the surface 4 of the tongue or prong is fiat.

Any desired shape may be given the head 2, according to the die employedfor stamping the tacks. As an example of one shape which has artistic aswell as practical de si n, is that shown in Figs. 4 and 5.

n Fig. 6, I show a still further modified form wherein only a portion ofthe body 2 lies flat on the same plane with the paper which is beingheld in place by a thumb tack. The balance of the body 2 being upwardlyinclined and the prong 3 thereof bent at substantially ri ht angles tothat portion of the body whic 1 is in a plane parallel to the plane ofthe drawing board or the paper which is to be held in place.

Having now set forth the objects and na-' ture of my invention, what Iclaim as new and useful, and of my own invention, and desire to secureby Letters Patent, is,-

A thumb tack comprising a stamping from sheet metal in the form of ahead and a tapering pointed tongue extending from one edge thereof, saidtongue being bent downwardly from the central portion of the edge and atsubstantially right angles to said head and provided with a flat surfacedisposed toward said head substantially as and for the purpose setforth.

In testimony whereof I have hereunto set my hand on this 11th day ofFebruary, A. D. 1919.

YOKICHI KINOSHITA.

